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Note 6 - Long-term Debt (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Long-Term Debt Instruments [Table Text Block]
  

March 31,

2022

  

December 31,

2021

 

Long-term portion of Avenue Ventures note payable

 $-  $10,625,000 
  $-  $10,625,000